2026-10-12T00:11:34Z https://www.scidb.cn/oai

10.57760/sciencedb.40543 2026-06-22T10:29:41Z

2026-06-22 Flexible ultrabroadband metamaterial absorber doi:10.57760/sciencedb.40543 en We herein prepare MAs by filling a three-dimensionally printed flexible thermoplastic polyurethane (TPU) shell with a composite lossy medium comprising chain-branch-structured conductive Ni particles dispersed in a flexible epoxy matrix at different loadings. The gradient serpentine unit cell of the MAs provides mechanical stretchability and a graded impedance profile minimizing reflection across a wide frequency range, while the Ni filler provides a three-dimensional conductive network enabling both dielectric and magnetic loss mechanisms, as revealed by the results of electromagnetic parameter measurements at 2–18 GHz. The best balance between impedance matching and energy dissipation is achieved using a full-wave simulation–optimized gradient serpentine geometry and a Ni loading of 60 wt%. The corresponding MA exhibits an exceptional absorption bandwidth (3.2–40 GHz), polarization-insensitive behavior, wide-angle stability (incidence angle = 0°–65°), and outstanding mechanical flexibility, withstanding tensile strains of >200% without structural failure. metamaterial; absorber; Ni Zhen Yang RESTRICTED dataset http://www.doi.org/10.2139/ssrn.6993115 Science Data Bank